RU-ALLRUSSIAN 1963 Problem 9
Given a triangle ABC. Let the line through C parallel to the angle bisector of B meet the angle bisector of A at D, and let the line through C parallel to the angle bisector of A meet the angle bisector of B at E. Prove that if DE is parallel to AB, then .
Dataset text NuminaMath olympiads. Quoted with source.
Solutions
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